Are there other sets of EA-re­lated open ques­tions that I’ve left out of this list, and that aren’t on Richard’s list?

Speci­fi­cally, I’m look­ing for ques­tions that could be solved through re­search or ex­per­i­men­ta­tion, rather than “pro­jects” that re­quire com­pet­i­tive ex­e­cu­tion (“could some­one cre­ate an Ama­zon for char­i­ta­ble dona­tions?” doesn’t count, but “what fac­tors lead to some­one re­peat­edly us­ing a dona­tion web­site?” could).